Ball machine



R. GREY.

BALL MACHINE. APPLICATION FILED FEB. 25, 1920. RENEWED on. s, 1921.-

1,410,85 1. Patented 28, 1922.

a 2 SHEETS-SHEET l- INVENTOR.

R. GREY.

BALL MACHINE.

APPLICATION FILED FEB. 25, 1920. RENEWED OCT- 6,192!- I Patented Mar.28, 1922.

2 SHEETS-SHEET 2.

UNITED STATES PATENT orricn.

ROBERT GREY, OF. SAN FRANCISCO, CALIFORNIA, ASSIGN OR TO NATIONAL-COMPANY, ACORPORATION OF CALIFORNIA.

BALL Macrame.

Z '0 all whom it may concern Be it known that I, ROBERT GREY, a citizenof the United States, residing at San Francisco, in the county of SanFrancisco, State of California, have invented a new and useful BallMachine, of which the following is a specification in such full andclear terms as will enable those skilled in the art to construct and usethe same.

This invention relates to a ball mill, and its object is to produce aneasily constructed mill which is extremely effective and which requiresthe minimum of machine work to produce.

Another object of the invention is to produce a mill which will have anextremely simple driving mechanism, a belt being applied to the milldirectly and which driving mechanism is normally held in a centralposition by means of suitable rods and springs which enable balls anddriving pulley to shift and raise as ma be necessary due to obstructionsover w ich the balls may pass without interference to the operation ofthe mill.

Another object of the invention is to so shape the grinding pan as togive it the maximum wearing capacity in the general direction. in whichthe balls tend to move, as the pan wears on account of the rinding.

Other objects of the invention wi 1 appear as the description proceeds.

An embodiment of the invention is shown in the drawings in which thesame reference number is used throughout, but I am aware that there maybe modifications thereof.

Fig. 1 is a view in side elevation of the machine, one half being shownin vertical section.

Fig. 2 is a plan view of the machine one portion thereof being brokenaway.

The mill is mounted upon a suitable concrete base 1 in which there is animbedded center shaft 2, having a horizontally extending pin 3 to assistin holding it properly positioned. .Mounted upon the base 1, which baseis surrounded by suitable timbers 4, is a mill pan 5; this pan is curvedin vertical section and forms a suitable annulus in which the renewablegrinding pan 6 is placed.

Resting upon the grinding pan 6 are plurality of balls 7 and restingupon the balls is a curved ring 8, said ring having an upwardlyextending flange 9 for securing it Specification of Letters Patent. IPatnted l\Ia1,28-, 1922.

0ctober6, 1921. Sean No. 565,923.

to the pulley ring 10 bolts 11 being used for this purpose. The pulleyring has a plural- FINANCE ity of inwardly extending lugs 12, each of Vwhich receives a rod 13, and the rods 13 are in turn each connected bymeans of a short link 14 and two pins 15 and 16, with a cap 17 on thetop of the shaft 2. I

On the outer end of each of the rods 13 there is a nut 18 which bearsupon the spiral spring 19, there being one spring for each of the rods.The rod 13 passes through a cylinder 20 which forms a receptacle inwhich the ore being ground is fed. This cylinder has an inwardly turnededge 21 at its bottom, to discharge the ore against the feed cone 22,which also rests upon the inner edge of the mill pan 5. At intervalsaround the mill pan there are posts 23, secured thereto by means ofbolts 24-25, there being four bolts for each post, these posts flareoutwardly and turn to the vertical at their upper portion, as indicatedat 26 to support a sheet metal ring 27 which extends around the mill toprevent the splash from getting over the screens 28. The screens areheld in place by means of suitable wedges 29 and blocks 30, carried byposts 23.

In operation the ore to be broken is dropped into the cylinder 20 andslides down to cone 22 to the grinding pan 6. The inner edge of thegrinding pan is shaped to befree of the grinding balls 7 when the die isnew,

as indicated at 31. As the die wears the arc of contact of the ballstherewith becomes greater and the die may be used until the ball is wornthrough it far enough to touch the upper edge of the inner portion ofthe pan 5, whereupon the new die must be placed in position to preventinjury to the mill itself. It will also be noticed that the outer edgeof the pan is higher than the inner edge, this being for the purpose ofcausing the die to wear down evenly. Its height being determined inaccordance with the speed of the mill desired, that is, with a highspeed mill, the pan would have to be higher than with a low speed mill.

What I claim is as follows, but various modifications may be made in theconstruction shown in the drawings and above particularly describedform, within the purview of my invention:

1. A ball grinding mill comprising the combination of a grinding anhaving a renewable ring therein, balls t ereon, a ring resting upon saidballs, a pulley ring connected therewith, and resilient means forholding said pulleyring central with respect to the axis of the pan.

2. A ball grinding mill comprising the combination of a pan having arenewable" wearing ring, balls thereon, a pulley ring for drivingsaidballs by friction, a-vertically.

extending center shaft, 2, cap slideble thereon, universal jointsconnecting outwardly 10 extending radial rods thereto, and springsconnecting. theipulley. ring. and said rods for V holdingthepul'ley ringcentrally positioned.

In testimony whereof I have hereunto set my handthis' 17th day ofFebruary A. D. 15

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